Galaxy S will absolutely meet your criteria and more
Please do not consider Galaxy SL. Here is my recommendation:
1) Galaxy S (Personally have used the Indian version. Have used US variants like Vibrant, Captivate and Epic 4g)
Price - 19840 rs
Form Factor - Bar
Input - Touchscreen (Gorilla Glass and scratch resistant)
Display - Super Amoled. Unlimited viewing angles or as I am told. Absolutely brilliant legibility in direct sunlight
Brand - Samsung
Camera - Excellent camera at 5 MP with 720p Video recording and playback
OS - Android 2.3.4
Connectivity - 3G, Wifi b/g/n and also acts as wireless hotspots for other devices to connect
Usage - Brilliant for reading ebooks, playing games etc because of Super Amoled screen. Excellent video playback and plays MP4, AVI, MKV files with default video player with ease. Super Amoled screen is absolutely stunning with 720p videos. Audio is also brilliant with Wolfson DAC chip
Specs -
Samsung I9000 Galaxy S - Full phone specifications
2) Google Nexus S (Personal experience as I own Nexus S)
Price - 19899 rs
Form Factor - Bar
Display - Super LCD so it has excellent screen resolution and good legibility in direct sunlight.
Brand - Google with Samsung
Input - Touch screen (Contour glass display/Anti Fingerprint Oleophobic surface/NOT GORILLA GLASS, SO prone to scratches if screen protector is not applied)
Camera - 5 MP with LED Flash, But no 720p recording. Also has Front camera for video calling
OS - Android 2.3.4 (2.3.5 already released for my Sprint Nexus S 4g and will soon to other models)
Connectivity - 3g, WiFi b/g/n and also wireless hotspot/tethering
Usage - Super LCD while a bit inferior to SAmoled (IMHO) is still excellent for reading ebooks, playing games and also for internet. For movies, it does not have dedicated video player but still you can download Rockplayer lite or VPlayer from market and play the files with ease. Audio is identical to Galaxy S so expect an excellent audio experience.
Other Advantages - Pure Google experience and on time or priority updates directly from google. With custom rom and modifications, it can absolutely turn into a beast.
Specs -
Samsung Google Nexus S I9023 - Full phone specifications
3) LG Optimus 2X
Price - 19999 (maybe temporary price drop) or 23k
Form Factor - Bar
Display Type - IPS LCD with 16M colors, so it should have decent legibility in sunlight
Brand - LG
Input - Touchscreen (Gorilla glass and scratch resistant)
Camera - 8 MP with LED Flash that is capable of 1080p video recording and playback (please refer to specs for details) Also has Front camera for video calling
OS - Android 2.2 froyo but update is imminent
Connectivity - 3g, Wifi and also tethering/hotspot
Usage - Should handle all the tasks as per your requirement plus more. It has excellent video since it supports up to 1080p. Audio is also good but personally I found my Galaxy and Nexus to be better. Maybe I got used to it.
Other Advantages - It is a dual core phones so the performance is obviously going to be better than single core phones like Nexus S or Galaxy S.
Specs -
LG Optimus 2X - Full phone specifications
4) Motorola Defy (It has been a darling phone for some members here in TE given the price and how it performs when modded)
Price - 14.5 k
Form Factor - Bar
Display Type - LCD screen with 16M colors, so should have decent legibility in direct sunlight
Brand - Motorola
Input - Touchscreen (Gorilla Glass and scratch resistant)
Camera - 5 MP camera with LED Flash. Not capable of 720p right out the box. Maybe with firmware tweaking or future updates
OS - Android Froyo 2.2 (But with custom mod, it is already running 2.3.3)
Connectivity - 3G and also WiFi tethering and hotspot
Usage - It has good LCD with 16m colors for books and games. Video is good but mixed opinions. Audio is also good but with mixed opinions.
Other Advantages - Long Lasting due to being the rugged water/dust proof phone in the market. How about "its the only water/dust proof in the market" So given the price and how long it lasts is a steal for some members.
Specs -
Motorola DEFY - Full phone specifications
Other notables -
LG Optimus Black - Priced at 19.9k, it has specs similar to Motorola defy. Except that Defy processor is rated at 800 MHz and LG Optimus Black at 1 GHz. But gaming or video wise it is not worth it to buy it over Galaxy or Nexus S. Only advantage is that it has brightest display
Specs -
LG Optimus Black P970 - Full phone specifications
Samsung Galaxy SL - Once again priced at 19.4k and similar to specs as LG Optimus black I would not recommend spending for it. Only advantage is that it has Super LCD screen.
Specs -
Samsung I9003 Galaxy SL - Full phone specifications
Hope this helps.